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    SubjectRe: 2.5 Problem Status Report
    Hello!

    On Wed, Sep 11, 2002 at 09:26:40AM +0200, Ingo Molnar wrote:
    > > > > BUG at kernel/sched.c open 10 Sep 2002
    > > > What exactly is this?
    > > Looks like this is my bugreport for BUG in kernel/sched.c:944 in the middle
    > > of partition parsing output on boot.
    > > Subject of email was
    > > '2.5.34 BUG at kernel/sched.c:944 (partitions code related?)'
    > > msgid: 20020910175639.A830@namesys.com
    > very strange backtrace:
    > >>EIP; c0115818 <schedule+18/4a0> <=====
    > Trace; c01053a0 <default_idle+0/40>

    I noticed it too.

    > i've once seen the 2.5 IDE code doing a schedule_timeout() from an IRQ
    > handler, but the above has to be something else. Could you hack sched.c to
    > print out the exact preemption count? It could be a preempt-count
    > underflow due to an unbalanced spin_unlock, or an inbalanced
    > preempt_enable. [or the IRQ code - but i doubt that, we'd have seen

    I have preemption disabled.

    > problems much earlier if this was the case.]

    > Oleg, do you have CONFIG_DEBUG_SPINLOCK enabled? That should catch an
    > unbalanced spin_unlock().

    Yes, I do.
    CONFIG_DEBUG_KERNEL=y
    CONFIG_DEBUG_SLAB=y
    CONFIG_MAGIC_SYSRQ=y
    CONFIG_DEBUG_SPINLOCK=y
    CONFIG_DEBUG_HIGHMEM=y

    Bye,
    Oleg
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